Merge branch 'feature/send-identifier-on-oauth-error' into 'develop'

Send an identifier alongside with error message in OAuthController

See merge request pleroma/pleroma!1765

test/web/oauth/oauth_controller_test.exs

@@ -852,6 +852,7 @@ defmodule Pleroma.Web.OAuth.OAuthControllerTest do
       assert resp = json_response(conn, 403)
 
       assert resp["error"] == "Password reset is required"
+      assert resp["identifier"] == "password_reset_required"
       refute Map.has_key?(resp, "access_token")
     end